Chapter Exam

Unit 12: Coordination Compounds — Online MCQ Test

Q: Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

Answer: D. SCN- < F- < C2O4 2- < CN- — According to the spectrochemical series, the order of increasing field strength for these ligands is SCN- < F- < C2O4 2- < CN-.

Q: Which of the following are paramagnetic? A. [NiCl4]²⁻ B. Ni(CO)₄ C. [Ni(CN)₄]²⁻ D. [Ni(H₂O)₆]²⁺ E. Ni(PPh₃)₄

Answer: C. A and D only — [NiCl₄]²⁻ (sp³) is paramagnetic (2 unpaired e⁻). Ni(CO)₄, [Ni(CN)₄]²⁻, and Ni(PPh₃)₄ are diamagnetic. [Ni(H₂O)₆]²⁺ (sp³d²) is paramagnetic (2 unpaired e⁻).

Q: Iron carbonyl, Fe(CO)5 is

Answer: D. Mononuclear — Fe(CO)5 contains only one iron atom, therefore it is classified as mononuclear.

Q: Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code: Column I: a. Co3+, b. Cr3+, c. Fe3+, d. Ni2+ Column II: i. 8 B.M., ii. 35 B.M., iii. 3 B.M., iv. 24 B.M., v. 15 B.M.

Answer: D. (4) iii v i ii — Spin magnetic moment = sqrt(n(n+2)) BM. Co3+ (3d6, n=4) -> sqrt(24)=4.9, Cr3+ (3d3, n=3) -> sqrt(15)=3.87, Fe3+ (3d5, n=5) -> sqrt(35)=5.9, Ni2+ (3d8, n=2) -> sqrt(8)=2.82. Matches: a-iii, b-v, c-i, d-ii.

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Unit 12: Coordination Compounds — Important Questions & Answers (FAQ)

Frequently asked questions from NEET NEET (All) CHEMISTRY — Unit 12: Coordination Compounds, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

A. SCN- < F- < CN- < C2O4 2-
B. F- < SCN- < C2O4 2- < CN-
C. CN- < C2O4 2- < SCN- < F-
D. SCN- < F- < C2O4 2- < CN- ✓

Answer: D. SCN- < F- < C2O4 2- < CN-
According to the spectrochemical series, the order of increasing field strength for these ligands is SCN- < F- < C2O4 2- < CN-.

Which of the following are paramagnetic? A. [NiCl4]²⁻ B. Ni(CO)₄ C. [Ni(CN)₄]²⁻ D. [Ni(H₂O)₆]²⁺ E. Ni(PPh₃)₄

A. A and C only
B. B and E only
C. A and D only ✓
D. A, D and E only

Answer: C. A and D only
[NiCl₄]²⁻ (sp³) is paramagnetic (2 unpaired e⁻). Ni(CO)₄, [Ni(CN)₄]²⁻, and Ni(PPh₃)₄ are diamagnetic. [Ni(H₂O)₆]²⁺ (sp³d²) is paramagnetic (2 unpaired e⁻).

The correct order of the wavelength of light absorbed by the following complexes is: A. [Co(NH₃)₆]³⁺ B. [Co(CN)₆]³⁻ C. [Cu(H₂O)₄]²⁺ D. [Ti(H₂O)₆]³⁺

A. B < D < A < C
B. B < A < D < C ✓
C. C < D < A < B
D. C < A < D < B

Answer: B. B < A < D < C
Wavelength absorbed is inversely proportional to crystal field splitting (Δ). Stronger ligands cause higher splitting, hence lower wavelength absorbed. Order of field strength: CN⁻ > NH₃ > H₂O.

Iron carbonyl, Fe(CO)5 is

A. Tetranuclear
B. Dinuclear
C. Trinuclear
D. Mononuclear ✓

Answer: D. Mononuclear
Fe(CO)5 contains only one iron atom, therefore it is classified as mononuclear.

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code: Column I: a. Co3+, b. Cr3+, c. Fe3+, d. Ni2+ Column II: i. 8 B.M., ii. 35 B.M., iii. 3 B.M., iv. 24 B.M., v. 15 B.M.

A. (1) iv v ii i
B. (2) i ii iii iv
C. (3) iv i ii iii
D. (4) iii v i ii ✓

Answer: D. (4) iii v i ii
Spin magnetic moment = sqrt(n(n+2)) BM. Co3+ (3d6, n=4) -> sqrt(24)=4.9, Cr3+ (3d3, n=3) -> sqrt(15)=3.87, Fe3+ (3d5, n=5) -> sqrt(35)=5.9, Ni2+ (3d8, n=2) -> sqrt(8)=2.82. Matches: a-iii, b-v, c-i, d-ii.